Which statement best describes the function of a furnace heat exchanger?

Which statement best describes the function of a furnace heat exchanger?

• A. Filters the combustion air before it enters the burner.
• B. Transfers heat from the combustion chamber to the supply air that heats the conditioned space.
• C. Reduces humidity in the air.
• D. Regulates the exhaust temperature.

Answer: (B)

The heat exchanger’s job is to transfer the heat produced by burning fuel from the combustion chamber to the air that will be circulated through the house. As hot combustion gases flow through the exchanger, heat moves into the supply air, which then travels via ducts to warm the living spaces. This design keeps the combustion byproducts, like CO, outside the living area while delivering warm air inside. It’s not about filtering air, reducing humidity, or tweaking exhaust temperature—the primary function is efficient heat transfer to the conditioned space.

The heat exchanger’s job is to transfer the heat produced by burning fuel from the combustion chamber to the air that will be circulated through the house. As hot combustion gases flow through the exchanger, heat moves into the supply air, which then travels via ducts to warm the living spaces. This design keeps the combustion byproducts, like CO, outside the living area while delivering warm air inside. It’s not about filtering air, reducing humidity, or tweaking exhaust temperature—the primary function is efficient heat transfer to the conditioned space.